#include<stdio.h>
int main(int argc, char const *argv[])
{
    int a,count=0;
    for(a=5;a<=100;a+=5)
    {
        count++;
        if(!(a%25))
            count++;    
    }
    printf("the number of 0 in the end of 100 !is:%d.\n",count);
    return 0;
}
